{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64091", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:40:00.030Z", "dateUpdated": "2026-07-19T15:40:00.030Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:00.030Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix TOCTOU race for reported vlans\n\nThe local TT based TVLV is generated by first checking the number of VLANs\nwhich have at least one TT entry. A new buffer with the correct size for\nthe VLANs is then allocated. Only then, the list of VLANs s used to fill\nthe VLAN entries in the buffer. During this time, the meshif_vlan_list_lock\nis held. But the actual number of TT entries of each VLAN can still\nincrease during this time - just not the number of VLANs in the list.\n\nBut the prefilter used in the buffer size calculation might still cause an\nincrease of the number of VLANs which need to be stored. Simply because a\nVLAN might now suddenly have at least one entry when it had none in the\npre-alloc check - and then needs to occupy space which was not allocated.\n\nIt is better to overestimate the buffer size at the beginning and then fill\nthe buffer only with the VLANs which are not empty."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/translation-table.c"], "versions": [{"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "724a8eb4155669797c96b70d70e354284ae3b5a8", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "211ea59988e1cba43cb0367ad65d379b56f9c3bd", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "65a1e67339aa8c95ac544b796946af388930ee23", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "b4d4efd4e351593c81e9293d4b4408d244fa5ee7", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "9a9c859457bc440a55773e01ff18b1bb5bab6836", "status": "affected", "versionType": "git"}, {"version": "16116dac23396e73c01eeee97b102e4833a4b205", "lessThan": "94d27005016be15ffc638b2ecbc4d58805ad7b48", "status": "affected", "versionType": "git"}, {"version": "3134c5a32810c510f1f447c135cec346acbb71c3", "status": "affected", "versionType": "git"}, {"version": "e861e03a1b5b615ad1b57b1802b17e260eedccfe", "status": "affected", "versionType": "git"}, {"version": "0b81edc8818903c64c4d121bc51cd5825be8cc67", "status": "affected", "versionType": "git"}, {"version": "90ae6475b1753f0c1a4c66034b5666de3189fac8", "status": "affected", "versionType": "git"}, {"version": "3.16.60", "lessThan": "3.17", "status": "affected", "versionType": "semver"}, {"version": "4.4.217", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.217", "lessThan": "4.10", "status": "affected", "versionType": "semver"}, {"version": "4.14.174", "lessThan": "4.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/translation-table.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.217"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.217"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.174"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b"}, {"url": "https://git.kernel.org/stable/c/724a8eb4155669797c96b70d70e354284ae3b5a8"}, {"url": "https://git.kernel.org/stable/c/211ea59988e1cba43cb0367ad65d379b56f9c3bd"}, {"url": "https://git.kernel.org/stable/c/65a1e67339aa8c95ac544b796946af388930ee23"}, {"url": "https://git.kernel.org/stable/c/b4d4efd4e351593c81e9293d4b4408d244fa5ee7"}, {"url": "https://git.kernel.org/stable/c/4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f"}, {"url": "https://git.kernel.org/stable/c/9a9c859457bc440a55773e01ff18b1bb5bab6836"}, {"url": "https://git.kernel.org/stable/c/94d27005016be15ffc638b2ecbc4d58805ad7b48"}], "title": "batman-adv: tt: fix TOCTOU race for reported vlans", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: batman-adv: tt: fix TOCTOU race for reported vlans", "id": "2502567", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502567"}, "csaw": false, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's batman-adv (Better Approach To Mobile Ad-hoc Networking - Advanced) component. A time-of-check to time-of-use (TOCTOU) race condition exists when processing reported VLANs. This occurs because the buffer size for VLAN entries is calculated before the entries are fully populated, allowing the number of required VLANs to increase beyond the allocated buffer. This could lead to memory corruption, potentially resulting in a denial of service or other unpredictable system behavior."], "name": "CVE-2026-64091", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64091\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64091\nhttps://lore.kernel.org/linux-cve-announce/2026071917-CVE-2026-64091-9273@gregkh/T"]}

{}